Consider the equivalent circuit of the op-amp shown in Figure 9.7(a). Assume terminal \(v_{1}\) is grounded and the input to terminal \(v_{2}\) is from a transducer that can be represented by a \(0.8 \mathrm{mV}\) voltage source in series with a \(25 \mathrm{k} \Omega\) resistance. What is the minimum input resistance \(R_{i}\) such that the minimum differential input voltage is \(v_{i d}=0.790 \mathrm{mV}\) ?

Figure 9.7(a):-

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